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Intracellular Formation of a DNA Damage-Induced, Histone Post-Translational Modification Following Bleomycin Treatment.

ABSTRACT: Evaluating the significance of various forms of DNA damage is complicated by discoveries that some lesions inactivate repair enzymes or produce more deleterious forms of damage. Histone lysines within nucleosomes react with the commonly produced C4'-oxidized abasic site (C4-AP) to concomitantly yield an electrophilic modification (K_MP) on lysine and DNA strand scission. We developed a chemoproteomic approach to identify K_MP in HeLa cells. More than 60 000 K_MP-modified histones are produced per cell. Using LC-MS/MS, we detected K_MP at 17 of the 57 lysine residues distributed throughout the four core histone proteins. Therefore, K_MP constitutes a DNA damage-induced, nonenzymatic histone post-translational modification. K_MP formation suggests that downstream processes resulting from DNA damage could have ramifications on cells.

SUBMITTER: Jacinto MP

PROVIDER: S-EPMC9121625 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature

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Intracellular Formation of a DNA Damage-Induced, Histone Post-Translational Modification Following Bleomycin Treatment.

Jacinto Marco Paolo MP Fried Stephen D SD Greenberg Marc M MM

Journal of the American Chemical Society 20220425 17

Evaluating the significance of various forms of DNA damage is complicated by discoveries that some lesions inactivate repair enzymes or produce more deleterious forms of damage. Histone lysines within nucleosomes react with the commonly produced C4'-oxidized abasic site (C4-AP) to concomitantly yield an electrophilic modification (KMP) on lysine and DNA strand scission. We developed a chemoproteomic approach to identify KMP in HeLa cells. More than 60 000 KMP-mod ...[more]

PMID: 35467863

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